I have the 8830 and use a motorola headset but it sounds muffled also I have a Pathfinder and using the bluetooth inside my SUV sounds the same muffled.
I updated the firmware with no luck is there anything else I could do.
The 8703e sounds great but why not the international?
I have the m h500 and I have had complaints of being in a tunnel. Also, I have had to repeat myself a lot with it. I am planning on switching to another unit, just haven't decided which one yet.